| affect child | 0.56 |
| circulate in nigeria | 0.46 |
| remain endemic | 0.45 |
| exist in pakistan | 0.43 |
| exist in afghanistan | 0.41 |
| threaten even one child | 0.40 |
| be a disease of the past | 0.36 |
| be a plane ride | 0.34 |
| make comeback | 0.34 |
| attack nervous system | 0.33 |
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| paralysis | 0.49 |
| death | 0.45 |
| symptom | 0.40 |
| muscle weakness | 0.37 |
| pneumonia | 0.19 |
| severe illness | 0.16 |
| meningitis | 0.16 |
| endemic | 0.65 |
| contagious | 0.43 |
| prevalent | 0.40 |
| rare | 0.37 |
| rampant | 0.36 |
| preventable | 0.35 |
| active | 0.31 |
| fatal | 0.31 |
| incurable | 0.29 |
| asymptomatic | 0.19 |
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| disease | 0.50 |
| second human disease | 0.39 |
| crippling disease | 0.32 |
| eradicated | 0.68 |
| caused by virus | 0.49 |
| spread | 0.48 |
| eradicated in the unite… | 0.46 |
| defeated | 0.45 |
| brought under control | 0.36 |
| eradicated in india | 0.32 |
| eliminated as a public … | 0.30 |
| declared eradicated | 0.30 |
| eradicated in nigeria | 0.28 |
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